Hi, what are some fish that enjoy very fast flow and cold water, like a river. They have to be compatible with Hillstream loaches and not outgrow the 75 Gallon which is 4ft long. Filtration wise, a canister that does 530G/H and there would also be a powerhead at the opposite side of the tank, the tank with have sand, smooth pebbles, few small Anubias and moss, and some driftwood. I know about danio and mountain minnows as good options but what else? I heard there are some freshwater gobies, what type would work there? And what other fish?